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Rhys Weatherley 11f16a223a Update docs
2016-03-13 08:28:23 +10:00

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<div class="title">Telnet server example </div> </div>
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<div class="textblock"><p>The <a class="el" href="classShell.html" title="Command-line shell access. ">Shell</a> class provides a Unix-like shell for issuing commands to the Arduino. The <a class="el" href="classLoginShell.html" title="Command-line shell access via a login shell. ">LoginShell</a> class extends <a class="el" href="classShell.html" title="Command-line shell access. ">Shell</a> to also include login functionality. The user is prompted for username and password before access is granted to shell commands.</p>
<p>This example shows how to use <a class="el" href="classLoginShell.html" title="Command-line shell access via a login shell. ">LoginShell</a> to provide command-line access over the Internet via the telnet protocol. The example has one command "led" for turning the status LED on D13 on and off.</p>
<p>The full source code for the example follows:</p>
<div class="fragment"><div class="line"></div>
<div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment">This example demonstrates how to create a simple telnet server.</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">This example is placed into the public domain.</span></div>
<div class="line"><span class="comment">*/</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include &lt;SPI.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;Ethernet.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;Shell.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;LoginShell.h&gt;</span></div>
<div class="line"></div>
<div class="line">byte macAddress[6] = {</div>
<div class="line"> 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED</div>
<div class="line">};</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> ledPin = 13;</div>
<div class="line"></div>
<div class="line">EthernetServer server(23);</div>
<div class="line">EthernetClient client;</div>
<div class="line"><span class="keywordtype">bool</span> haveClient = <span class="keyword">false</span>;</div>
<div class="line"></div>
<div class="line"><a class="code" href="classLoginShell.html">LoginShell</a> shell;</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> cmdLed(<a class="code" href="classShell.html">Shell</a> &amp;shell, <span class="keywordtype">int</span> argc, <span class="keyword">const</span> <a class="code" href="classShellArguments.html">ShellArguments</a> &amp;argv)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordflow">if</span> (argc &gt; 1 &amp;&amp; !strcmp(argv[1], <span class="stringliteral">&quot;on&quot;</span>))</div>
<div class="line"> digitalWrite(ledPin, HIGH);</div>
<div class="line"> <span class="keywordflow">else</span></div>
<div class="line"> digitalWrite(ledPin, LOW);</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><a class="code" href="classShell.html#a809d96cf913bf11d02f3c0d51a120740">ShellCommand</a>(led, <span class="stringliteral">&quot;Turns the status LED on or off&quot;</span>, cmdLed);</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> setup()</div>
<div class="line">{</div>
<div class="line"> <span class="comment">// Configure I/O.</span></div>
<div class="line"> pinMode(ledPin, OUTPUT);</div>
<div class="line"> digitalWrite(ledPin, LOW);</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Start the serial port for status messages.</span></div>
<div class="line"> Serial.begin(9600);</div>
<div class="line"> Serial.println();</div>
<div class="line"> Serial.print(<span class="stringliteral">&quot;Acquiring IP address ... &quot;</span>);</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Start Ethernet running and get an IP address via DHCP.</span></div>
<div class="line"> <span class="keywordflow">if</span> (Ethernet.begin(macAddress))</div>
<div class="line"> Serial.println(Ethernet.localIP());</div>
<div class="line"> <span class="keywordflow">else</span></div>
<div class="line"> Serial.println(<span class="stringliteral">&quot;failed&quot;</span>);</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Listen on port 23 for incoming telnet connections.</span></div>
<div class="line"> server.begin();</div>
<div class="line"> shell.setMachineName(<span class="stringliteral">&quot;Arduino&quot;</span>);</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> loop()</div>
<div class="line">{</div>
<div class="line"> <span class="comment">// Maintain the DHCP lease over time.</span></div>
<div class="line"> Ethernet.maintain();</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Handle new/disconnecting clients.</span></div>
<div class="line"> <span class="keywordflow">if</span> (!haveClient) {</div>
<div class="line"> <span class="comment">// Check for new client connections.</span></div>
<div class="line"> client = server.<a class="code" href="classTerminal.html#a111698c496d601ef7fe0ce4de8a6de9a">available</a>();</div>
<div class="line"> <span class="keywordflow">if</span> (client) {</div>
<div class="line"> haveClient = <span class="keyword">true</span>;</div>
<div class="line"> shell.<a class="code" href="classShell.html#ad9acba905b6e0b661cce19d57c067990">begin</a>(client, 5);</div>
<div class="line"> }</div>
<div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!client.connected()) {</div>
<div class="line"> <span class="comment">// The current client has been disconnected. Shut down the shell.</span></div>
<div class="line"> shell.<a class="code" href="classShell.html#a8a654aadd0b6a379309bb1007749e41d">end</a>();</div>
<div class="line"> client.stop();</div>
<div class="line"> client = EthernetClient();</div>
<div class="line"> haveClient = <span class="keyword">false</span>;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Perform periodic shell processing on the active client.</span></div>
<div class="line"> shell.<a class="code" href="classShell.html#afc45cae4ccfc76321a254bb617dce08c">loop</a>();</div>
<div class="line">}</div>
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